Upper Unit Gear Set - 18-2204 - Sierra
Replaces OEM part #
- MERCURY MARINE 43-75325A3
- Mercruiser V-6 and 470/485 (4 Cyl. etc.) and Gen II (S/N K999999 & BELOW) with 1.84:1 Gear Ratio (Drive Gear = 17 teeth, Driven Gear = 19 teeth).
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